Rat-trap.



G. A. LINDBERG. BAT TRAP. APPLICATION FILED MAR. 28, 1911.

1,044,202. Patented Nov. 12,1912.

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G. A. LINDBERG.

BAT TRAP. APPLICATION FILED MAJLZB, 1911.

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Patented Nov. 12,1912.

onarmns A. LINDBERG, or snanronn, PENNSYLVANIA? RAT-TRAP.

Specification of Letters la'tent.

Pat nted Nov. 12;}1912.

Application filed March 28, 1911. Serial No. 617,344.

To all whom it may concern:

Be it known that I, CHARLES A. LIND- BERG, a citizen of the United States, residing at Bradford, Pennsylvania, have invented certain new and useful. Improvements in Rat-Traps, of which the following is a specification This invention relates to means for ridding vessels, buildings, wharves and. the

like of rats or other rodent animals, and the object of the. invention is to' provide means whereby the bodies of the rats will be disposed of and will not be visibletoother rats. I

The invention relates to the features of construction and combination and arrangement of parts hereinafter described and particularly pointed out in the claim.

The invention is illustrated in the accompanying drawings in which I Figure 1 is a sectional plan view of arrangement of the invention buttshowing the sewer pipe and the connection thereto in sectional elevation. Fig. 21s a central sectional view of one of the entrances. Fig.

3 is a front elevation of the same; Fig. 4; shows a modified form of spring door. Fig. 5 is a sectional view of a gravity door.

In carrying out the invention suitable tubing 1, such as the ordinary three inch stove pipe, which may be put together 'in joints in the ordinary way, is placed in the hollow spaces between partitions in building's, or in any other desirable place, for any length or. distance. At desired points in the main line of tubing, entrance pipes 3 are provided with lead into the room or place where the rats are likely to assemble. On top of each of these entrance pipes are provided a bait receptacle 4:. separated from the pipe by means of a'pe'rforat'ed bottom 5, and having a removable cover 6. At each end of the pipe 3- and at suitable points in the main line of tubing are provided spring or gravity doors 7 which permit the rat to enter, but prevent his return after once having started to enter the system. As shown in. the drawing, a door is providedfat each joint, Of course any form of non-return door may be used but that preferably used consists of a pair of members 8, hinged,at

their sides to a ring 9 held at the joint of the pipes. In order to securely hold the rings 9 at the joints, in a simple and fli- .cient manner, each ring is provided with an annular bead 9 near one face of the'r'ing,

which engages an internal groove in the end of the tube, and. said ring. has a. projecting annular flange 9? which is adapt.-

,ed to engage the end of the adjoining tube.

A spring 10 on the hinge keeps the members against the ring so that said members can The members of each pair have their meeting'edges cut away in the centerto provide a small opening 11 in the center of the door. The rat smells the bait at the entrance end,

' pushes its nose into the opening 11 and thus swings the members inwardly. If it attempts to pull back the edges of the members will grip it so that it cannot back out and it will be compelled to go forward. The rat finds itself in the first joint or entrance pipegi i, and it is the nature ofa rat that as soon as it is trapped it will make a despertherefore as it cannot get out the way it entered, it proceeds on to the f-end of the joint of the entrance pipe through thesett: 0nd door, which also opens in the direction that the rat desiresto' go, but prevents the rat from returning, and so reaches the main line, where he passes from joint to joint,

opening the spring door ateach joint as. it.

passes, until'it finally reaches the end of the line of pipe which, as' shown in the draw-r ing, leads to a sewer 2, or to a large tank of water or other liquid, or if the invention is only open in one direction, that is, inwardly.

ate effort to get at any possible opening;

used on a vessel, it would lead to the ex terior thereof. The last joint ofpipe is inclined downward at an angle of 45 so that as the rat starts down, the metal pipe being slippery, it is, bound. to be discharged into the water or sewer. If desired the receptacle into which the rat drops may be provided with live wires so as to electrocute the rat. r

In Fig. l. is shown a f rm of door which is made of one piece of perforated material and is hinged at the top of the ring by a spring hinge. Another form of door is shown in Fig. 5. In this form the door is held closed by gravity and the spring hinge is omitted.

If desired an indicating device 12 may be provided to keep a record of the number of rats disposed of. This device is operated by aprojection 13 on one of the doors, which,

when the door is raised by a rat, comes contact with a movable part 14 and so act? ates the indicator.

It may be necessary-in some places to lay some of the pipe at an incline or on an up grade, and also when said pipe is laid on I board a shi during times of rough weather,

the pipe wi 1 be thrown off the level by the pitching or rolling of the vessel. In such cases it will be difficult for the rat to run along on the smooth surface of the pipe. To obviate this, the'under side of the pipe is perforated by small holesperforated from the outside inwardly sot-hat the inside of the surfaceis a little rough; as shown at 15 at the right hand end ofFig. l, and this will givethe ratsufiicient footing to climb the In a rat trap of the character described; a

cylindrical tube of sheet metal of a diameter but slightly in excess of the size of a rat, a ring 9 having a bead engaging an annular internal groove in the end of the tube, and having" a projecting flange adapted to engage the end of an adjoining tube, and a pair of semicircular doors hinged to opposite sides of said ring, the free edges of said doors having central notches and abutting portions above and below the notches, and springs acting upon said doors and holding them normally pressed against the face of the ring, substantially as described.

In testimony whereof, I aflix mysignature in presence of two Witnesses.

- CHARLES A. LINDBERG. Witnesses:

' EDWIN E. TAIT, KATHARINE BURKE. 

